Generator



April 2, 1946.

L. H. MIDDLETON GENERATOR Filed April 15, 1943 3 Sheets-Sheet l 90232155 m N m April 2, 1946. L. H. MIDDLETON 4 GENERATOR Filed April 1943 s Sheets-Sheet 2 64 51 57 I2 53 63 h v 54 42 1w" 55 @Qb 44 INVENTOR.ESL /E H M/DDLETON BY I I April 2, 1946.

L. H. MIDDLETON GENERATOR Filed April 15, 1943 3 Sheets-Sheet 3 NH O R 1m -u Q U\ M M {B m m VENTOR.

- 55m: HM ppLEm/v BY I yl f/ Patented Apr. 2, 1946 UNITED sT TEs P TENTorrlca This invention relates to variable speed generators, moreparticularly to variable speed Benerators provided with regulatory.control devices forming a part of an electrical system shielded forradio emanations.

In the prior art variable speed generators provided with regulatoryapparatus have been highly developed. The regulatory apparatus usuallycomprising a reverse-current circuit breaker, a

s voltage regulator and a current regulator, all cooperating with thegenerator to control the output characteristics thereof. The use ofgenerators with such regulating equipment on automotive vehicles, eitherround wheel or track vehicles, has been so highly developed that verycompucated combinations of electrical apparatus resulted. This situationwas aggravated when the electrical system of the automotive vehicle wasprovided with wave-filtering devices and with shielding apparatus toprevent radio disturbances so that radio-receiving apparatus mountedupon the vehicle could be used for signaling purposes. The complicationsare burdensome under these circumstances and repairs to the electricalsystem become impracticable due to the fact that great diiiiculty isencountered in localizing a breakdown of the system. These diihcultiesare particularly undesirable in combat vehicles, such as tanks and thelike, where a failure of the electrical system results in the vehiclebecoming inoperative and, due to the fact that repairs cannot be readilymade, the vehicle is often inoperative for a considerable period oftime.

A principal object of this invention is to obviate the difficulties setforth in the previous paragraph by simplifying the electrical system ofan automotive vehicle, particularly that of the generating system,including the generator and its regulatory equipment, and itscooperative relation with the storage battery used in connectiontherewith.

This object is accomplished by simplification of the shielding means andby organizing the units of the electrical system intosub-assemblieswhich facilitates the localization oi'a breakdown andallows the repair thereof in the shortest possible time by thesubstitution of a fully-adjusted subassembly in the place of the unitwhich has broken down.

It is further contemplatedto simplify the cooperative relation betweenthe generator, th generator regulatory apparatus and the shielding meanswhich in a large measure obviates the use of electrical filteringdevices and conducts a tery through the agency of a single cable, thereturn circuit being madeto the generator through a common groundconnection. u

The fact that the electrical system is divided into cooperative unitarysub-assemblies also facilitates the enclosing of each of the units in aprotective envelope having a dual purpose, first- 1y, to shield eachinstrumentality against radio emanations and at the same time give thema. protective envelope against the action of weather or the like.Inasmuch as each of theinstrumentalities may be given a protectiveenvelope, sealing of this envelope is feasible at the factory where theinstruments of regulation for the generator may be carefully adjusted topredetermined standards and thereafter sealed to protect them fromtampering by inexperienced personnel. The protective envelope alsoallows these unitary sub-assemblies to be conveniently stored in arepair station without deterioration so that they will be quicklyavailable in a fully adjusted condition at anytime repairs to disabledvehicles are necessary.

Other objects and advantages of this invention relating to thearrangement, operation and function of the related elements of thestructure, to various details of construction, to combinations of partsand to economics of manufacture, will be apparent to those skilled inthe art upon consideration of the following description and appendedclaims, reference being had to the accompanying drawings forming a partof this specification wherein like reference characters designatecorresponding parts in the several views.

Fig. 1 is a side elevational view, partly in section, showing thecompleted assembled generator.

Fig. 2 is an end elevational view, taken along the line 2-2 of Fig. 1.

Fig. 3 is an end section, taken along the line 3-3 of Fig. 1.

Fig. 4 is a sectional elevation of a detail.

Fig. 5 is a sectional elevation of a binding post.

Fig. 6 is a schematic diagram of connections.

Fig. 7 is an end plan view of another modification of the regulatorhousing.

Fig. 8 is a cross sectional elevation of the modification shown in Fig.7.

Fig. 9 is a sectional elevation, taken along the line 99 of Fig. '7.

Referring to the drawings. particularly to Fig. 1, a relatively thicktubular frame it of magnetic material is provided for the generator andfitted charging current from the generator to the bat-1 with end headsII and l2 attached to the tubular portion ID by means of screws IIthreaded into end faces of the tubular portion. The end heads ii and itare provided with ball bearings (it and i5 which journal an armatureshaft ltliormlng a part of an armature assembly ll! adapted to ro tatebetween laminated pole shoes it or magnetic material attached to thetubular frame member it by means of screws [19. The armature shaft l6projects beyond the end head it and is given a splined conformation. Elladapted to cooperate with a pulley 2G to form a driving connection. Thepulley M is held on the armature chart by means of a nut 32 fitted to athreaded portion on the end of the spllned conformation Adjacent theinner end of the pulley 20 an integral air fan 23 is provided havingradial vanes 26 which, up on rotation of the pulley. causes the air tomove outwardly as shown by the arrows whereby a cooling current of airis caused to flow through the generator in a longitudinal direction aswill be described in further detail hereinaiter. The end heads it and itare provided with apertures 22d and 26 which allow the air to enter andleave the generator casing under the influence of the fan.

A commutator it is provided for the armature 51 adjacent the bearing[15, having cooperating brushes 2b to collect the electric currentgenerated by the armature during its rotation. The rotation of thearmature is obtained through the agency of the pulley ill by means ofbelt driven by a pulley 3t mounted on a propeller shaft 3!! of aninternal combustion engine :32 which may drive the vehicle on which thegenerator is mounted.

The laminated pole shoes l6 are provided with field coils which arepreferably connecmd in shunt with the armature ll. It is to be understood however that the generator may be or. a shunt-, compound orthird-brush type the in vention capable of being applied to all types ofgenerators.

to allow convenient manipulation oi brushes 28, or for their replacementwhen necessary. These apertures are covered by a plate 35 in a manner tobe further described hereinafter.

The end head i2 is provided with a circular central boss 36, having acentral aperture 3i in which is mounted the ball bearing 05 alreadydescribed. The aperture 3? is closed by an end plate of the same size asthe perimeter of the ereto by means oi metrical edge. the

screws end plate is attached reg prises base menib rably oi non-magnetic metals such as aluminum, and a cup shaped casing portion 53preferably or the same type of material, I

The base member 02 is preferably attached to the casing member 33 bymeans of screws i l (Fig. l) which project through apertures in the basemember 42 and are threaded into the side of the casing portion ll] whichis provided with a bulge 45 on its inner side to strengthen the sameadjacent the threaded aperture. Preferably there are five screwsprovided to attach the base member 42 to the casing member 63, and atthe point of cooperation a gasket member 36 is provided between the twoabutting surfaces to form a weatherproof seal. The gasket member 46 ispreferably positioned in a recess ll formed in the face of theperimetrical edge of the casing member 43.

In order to attach the sub assembly A. (Fig.

The tubular frame it is provided with openings 3d adjacent thecommutator 27.! a

anemia dh oomprising the base member 42 and the easling member 53including regulatory equipment to be described hereinafter, to the lugs46 of the end plate [12 of the generator sub-assembly B, aligningapertures are provided in the two members threaded by screws 48 whichcooperate with threaded apertures d9 formed in the face of the lugs lli.Referring to Figs. 2 and 3, a number of these screws 3% are provided inspaced relation around the perimeter of the casing or, preferably sixbeing provided to cooperate with the six lugs ill positioned on the endplate. Inwardly-extending bays bill are provided in the casing 53adjacent each of the screws til to allow convenient manual manipulationof these screws in attaching the casing 4'33 to, or removing the casing83 from the tubular frame it or" the generator. Electrical regulatoryand/or signaling apparatus are positioned within the casing 43 which arevenlently manipulated binding posts 56.

Referring to Fig. 5 of the drawings, the juntaposition of the end platel2 and the base plate 62 are shown enlarged to give the details ofbinding posts M which are utilized to place the regulating equipment,positioned in unitary sub-assembly A, in circuit with the generator ofsubassembly B. As shown in Fig. 6, two bindin posts Eli are provided,being substantially identical in construction and are given positions asshown in phantom in Fig. 2. The stud portion 52 of the binding post ispreferably positioned in an aperture 53 in the end plate l2, beingcarefully insulated therefrom by insulation o The stud 52 preferably isprovided with a head positioned on the inside face We of the end plate,being the portion by which electrical connection is made to thegenerator, one of the stud por tions being connected to the field whilethe other is connected to the armature as is most clearly shown in Fig.6. The stud portion 52 is held in position in the end plate by means ora nut 56 which cooperates with the threaded portion on.

the body or the stud.

Embracing the stud portion 52, a split collar bl is provided which iscontracted by a screw 68 adapted for manual manipulation to fit tightlyabout the stud portion till. The split collar til is preferably formedas a part of the head or a bolt which is positioned in an aperture or?the base plate 62, being insulated therefrom by insulation The belt isheld in j base plate by means a nut Eli) thereon, being provided withthe usual loci: 7 washers. Connection is made to the regulatoryapparatus the sub-assembly unit A by means oi a second nut which grips aterminal portion to form a solid electrical connection.

Before the unitary sub-assernb1y A can be positioned on the generatorsub-assembly B, and attached thereto by means of screws ll both splitcollars til must be positioned to embrace the stud portions 52 andthereafter the screws till are manipulated by means of a tool, such as ascrew driver, to firmly grip the stud portion to make a solid electricalconnection. It is, of course, clear that the two split collars mountedon the base member 42 and the two stud portions 52 mounted on the endplate l2 will be in alignment when the screws 48 are threaded into theircooperating apertures 49 in the lugs 40 of the end plate l2. The lugs 40are of such sufllcient height to maintain a spaced relation between thebase member 42 and the end plate l2 to allow the co- 76 operativerelation between the split collar porconnected in circuit with thegenerator by contions 81 and the stud portions 82 of the binding poststo be maintained. Manipulation of screws 88 may be accomplished at atime when the plate or band 38 is removed rrom its position on thetubular frame III of the generator.

Referring to Fig. 3, regulatory equipment comprising a reverse-currentcircuit breaker 18, a voltage regulator H and a current regulator 12 areresiliently mounted on the base member 2. Each of the three instruments,namely the reversecurrent circuit breaker, the voltage regulator and thecurrent regulator are preferably resiliently mounted on the base member42 in a manner that vibration and shocks, to which the generator issubject during use, will be absorbed by the resilient mounting and nottransmitted to the regulating apparatus to destroy its efliciency forcontrolling the electrical characteristics of the output of thegenerator.

It is particularly important that the current and voltage regulators bemounted on a very flexible resilient mounting to absorb these vibrationsand shocks inasmuch as these instruments are of a vibratory type inwhich it is very essential that the periods of vibration shall not bedisturbed, otherwise their function of regulating the output of thegenerator will be seriously impaired if not made entirely useless. Thecircuit breaker 10, being or a much more rugged instrument and notoperating upon a vibratory principle, it is not as essential that theresilient mounting be provided and in many cases it may be preferable todispense with the resilient mounting entirely.

The function and the operating characteristics of these instruments arein general well known in the art and may vary widely, depending upon theparticular regulating function they are to Fig. 6, where one sidethereof is grounded and the other is in contact with the binding post13. The upper end of the coaxial condenser 18 is sealed and terminatesagainst a shoulder 19 of a threaded sleeve 80 having an outwardlyextending flange 8| to cooperate with an aperture 82 formed in thebodyof the cup-like cover 43 mounted over the regulating apparatus beingfastened therein by means of a nut 8Ia. A gasket 80a is provided to sealthe sleeve 80 in position in the cup-like cover 43.

perform and to the type of equipment with which the generator is to beused. Furthermore, the characteristics of the generator itself, whetherit is a shunt, a compound or a third brush generator, will largelyinfluence the type of regulating equipment which is used in connectiontherewith.

The diagram of connections of the complete electrical system of thegenerator is shown schematically in Fig. 6 wherein the generatorsubassembly is designated by the letter B while the regulating equipmentincluding the circuit breaker the voltage regulator ii and thecurrentreguare connected as shown and designated I as a unit by theletter A. The output ner'ator is drawn from a binding post ndsexteriorly of the casing 53 as is most cle shown in Figs. 1, 2 and 3. Asis shown in i. and 5, the binding post it is connected by a singleconductor id to a battery '55, the opposite terminal of the batterybeing connected to ground, ordinarily being the metal frame of anautomotive vehicle so that a return circuit is made to the generatorwhich is also grounded as is clearly shown in Fig. l.

The binding post 73 is in the nature of a stud which is mounted by abase plate 16 (Fig. 3) at tached to the base M by means of screws ii.The binding post i3 is preferably riveted to the base piste it as isclearly shown in Fig. 1, and extends substantially normal to the base 42upon which mounted the regulating instruments as has iready beendescribed. Adjacent the lower portion of the binding post 13, a coaxialcondenser it is provided concentric therewith. The coaxial condenser 18is of a type well known in the art and need not be described in furtherdetail. It is connected in the circuit, as is clearly shown in Theaperture 82 is formed in the floor of a depression 83, which is insubstantially parallel relation with the base member 42, and a wall 84is provided normal to the fioor 83 to support the floor to define anindentation in the side 01 the cup-like cover 43. The purpose of thisindentation is to provide a convenient means for protecting the bindingpost 13 by placing it inside of the outside contour of the casing of thegenerator. Should, for example, the generator be dropped by a carelessoperator, the force of the blow would not fall upon the binding post toinjure it and make it inoperative.

The threaded sleeve 88 extends a considerable distance into thedepression 83 in the cup-like cover 43 and surrounds the upper end ofthe binding post it to form a, convenient means for attaching a shieldedcable into the circuit with the generator. The shielded cable (notshown) is provided with a threaded ferrule which is capable of beingscrewed to the outer end of the threaded sleeve to while the cable isplaced in contact with the binding post '53. The binding post it! isinsulated from and sealed in the sleeve 88 by means of an insulatingwasher 33 which is fitted between the shoulder 79 of the sleeve and theupper end of the coaxial condenser it.

Adjacent a central portion of the cup-like cover 33, a threaded aperture36 is provided into which is fitted a threaded sleeve 6? containing adisk of colored transparent material 98, such as glass or the like, anda screen iii? of metallic material to provide shielding for radioemanations. The transparent disk as and the screen 89 may be held in thesleeve 87 by any convenient means as, for example, by inturned flangesor the like. An internally-disposed boss 9b is provided in the cup-likecover 63 to give strength to the wall of the cover for supporting thesleeve till.

Immediately below the aperture tit, as closed by the'colored disk oftransparent material 88, a bulb 94 is provided which is mounted in asocket 32 positioned on a column 93 attached to the base 62 by screws Mwhich are iitted into outwardly extending flanges 95 formed on thecolumn @3. The bulb ill is placed in the electrical circuit of thegenerator by cooperating with the circuit breaker ill as is clearlyshown in Fig. 6. A pair of contact points @la and illb are provided,controlled by the circuit breaker armature so that the bulb will beilluminated when the circuit breaker is in normally open position, theillumihated bulb being clearly visible to an observer by lighttransmitted through the transparent disk 88. This condition will existwhenever the generator circuit, including the battery, is in nonchargingrelation, so that the circuit breaker ill 76 erator is charging thebattery.

As has been pointed out above, the generator unit B and the regulatorunit A, as shown in Fig. 6, cooperate together in the electrical sensethrough the agency of the separable binding posts and at the same timecooperate together in a physical sense by being fastened togetherthrough the agency of the screws 48 threaded into the columns which area part of the end head l2. If, for example, a breakdown should occur inthe regulating apparatus positioned within the regulator housing 4 I, anoperator to repair this breakdown would remove the entire unit A fromthe electrical system by removing the regulator housing M from itsposition on the columns at by first removing the screws 38 from theirthreaded relation with the column." At the same time the cable 14 willbe removed from its cooperative relation with the sleeve 8d and bindingpost it, and screws 58 of the binding post at will be loosened so thatthe two portions 52 and til thereof may be disengaged to allow theremoval of the regulator housing both from its physical and electricalcooperation with the generator.

A complete new regulator unit A, as positioned in the regulator housingll, is substituted in the place of the regulator unit in which thebreakdown occurred, This new regulator unit was fully adjusted andsealed at the factory so that it is in condition to be substituted inthe place of the inoperative unit without any further electricalmanipulation of the regulating instruments. It is, of course, clear thatthe band or plate 3'5, which cooperates with both the tubular housingiii of the generator and the base plate 32 of the regulator housing,must be removed in order to make the binding post 5!! available formanual operations necessary in substituting a new regu-= lator unit forone that has had a breakdown. To do this, a bolt 35a (Fig. 2) whichprojects through apertures in upstanding flanges 35b, positioned on theends of the plate 35, is loosened to expand the band to allow removalthereof from its operative position, The removal of the band 35 willopen the apertures 3G in the frame it to allow manual adjustment ofbrushes or cleaning of the cornmutator 2i], and also opens the spacebetween the end head ii? of the generator and the base plate d2 of theregulator housing ll to allow manipulation of the binding posts 5i.

After a new regulator housing G6 has been positioned on the generatorand the electrical connections made by adjustment of the binding postsill, the band 35 is again placed in position on the tubular housing,care being taken that apertures 350 are placed over the space betweenthe end head l2 of the generator and the base plate 42 of the regulatorhousing. The apertures 350 are necessary to allow entrance of air intothe generator which is drawn through the generator by means of fan 23 ashas already been described. That portion of the band which is nearestthe generator and covers openings 3G is imperforate to substantiallyseal the portion oi the generator housing it adjacent the commutetor 27so that all air which enters the generator must fiow'through apertures350.

The air entering the generator flows through the apertures 350 into thespace between the end head it of the generator and the base plate 62 ofthe regulator housing, then through apertures 26 in the end head it asis most clearly shown in Fig. 1, thence over the commutator to flowlongitudinally of the armature between the pole shoes i8 and thearmature ll to be drawn out into the atmosphere by means of the tan Aircur rents flowing in this path are given several abrupt changes ofdirection so that a cleaning action of the air occurs at each change ofdirection or flow whereby the heavy particles of dust tend by theirinertia to separate themselves from the flowing air. This action may befurther increased by causing the generator to be positioned as a whoiein an air current which flows in a direction parallel to the axis of theaxle IS on the exterior of the generator so that the air entering theapertures 350 must turn substantially a rightangle to enter thegenerator. If any dust particles or any extraneous material, such assand, are carried by the stream of air flowing along the outside of thetubular casing ill of the generator, there will be a tendency toseparate these particles from the air entering the generator due to theinertia of the particles.

Referring again to the drawings, particularly to Figs. 7, 8 and 9,another modification oi the regulator housing is shown which has a baseplate Hill having attached thereto a cup-like container lBl by means ofscrews idZ fitted into holes 392a and threaded into apertures act in thelip of the cup-like container tilt, six being provided for the purpose.A gasket not is seated in a recess M35 in the base plate to form aleakproof joint between the two casing portions.

On the base plate WE) are mounted a reversecurrent circuit-breaker Hit,a voltage regulator till, a current regulator Mid and a binding postHi9. In this instance the reverse circuit breaker is mounted directly onthe base plate by screws i it as shown in Fig. 8, no resilient cushionbeing provided in this instance. The voltage regulator lili and thecurrent regulator its, being both of the vibratory type, are mounted ona metallic platform 5 l i which is resiliently mounted on the base plateltd by means of tension springs M2 which are positioned in tensionbetween bosses ll it on the base plate, there being four provided, oneon each side of the platform lit and bosses Hi l on the platform, therebeing two bosses M6 on platform ill for each boss M3 on the base platelilli. Two ends of the springs flit cooperate with each of the bosses iit on the base while the other end of each of the springs cooperateswith a boss M8 on the platform Mt. Sets of opposing springs attached toopposite ends of the platform iii are preferably mounted in one plane,however it is preferable to mount the second set of opposed springs in adifierent plane as shown to give greater stability to the platform. Inthis manner two springs are provided for each side of the platform illso that, due to the tension of each of these springs, the platform issuspended in resilient relation between the four bosses M3 allowingmovement of the platform and also of the voltage regulator Hill and thecurrent regulator M38 mounted thereon freely in all directions by thisresilient connection between the base member and the platform. Thisconstruction substantially isolates the voltage regulator Gill and thecurrent regulator 108 from vibration or from jolts to which the baseplate lllt is subject during use of the generator or a vehicle. Thevibratory periods of these two regulators is thereby substantiallyundisturbed so that their efficiency in regulating the output of thegenerator is substantially unimpaired by extraneous effects fromvibration.

The binding post tilt is mounted in substantially the same manner as hasbeen heretofore described with reference to other modifications, beingagain provided with a coaxial condenser III. The binding post againextends into a bay H6 in the external surface of the cup-shapedcontainer I01, this bay being shown in Fig. 8 from the inside of thecasing. In other respects the binding post shown in Figs. 7 and 8 servesthe same function and is given substantially the same construction asthe binding post shown in Figs. 1, 2 and 3.

It will be notedthat in this modification 'of the regulator housing novisual signalling means is provided for indicating the chargingcondition of the generator having reference to a battery so that thecontact points 9| a andSlb, as described heretofore with reference toFigs. 1 and 6, has been dispensed with and these contacts have beenomitted from the circuit breaker I06.

Connection of these regulating instruments is made with the generator inthis regulator housing in a manner similar to that described in theother modification with the exception that the method lator housing withthe binding posts la has been changed from a bolt construction to ascrew fitted into a socket formed in the binding post. This binding postis shown in Fig. 9 in detail where the embracing portion H1 issubstantially identical with that shown in Fig. 5 and the screw i I8 isprovided to thread into a socket I I 9 formed in the body of the bindingpost. Two of these binding posts are again provided, with the screwholes I20 being located to coincide with the threaded apertures 49 inlugs 40 (Fig. 1) on the end head l2 of the generator so that theregulator housing, shown in Figs. 7 and 8, may be attachedinterchangeably with the regulator housing shown in Figs. 2 and 3. 'I'hebinding posts and screw holes are all given a standard dimension so thatthe interchangeability may be readily carried through.

It is to be understood that the above detailed description of thepresent invention is intended to disclose an embodiment thereof to thoseskilled in the art, but that the invention is not to be construed aslimited in its application to the details of construction andarrangement of parts illustrated in the accompanying .drawings, sincethe invention is capable of being practiced and carried out in variousways without departing from the spirit of the invention. The languageused in the specification relating to the operation and function of theelements of the invention is employed for purposes of description andnot of limitation, and it is not intended to limit the scope of thefollowing claims beyond the requirements of the prior art.

What is claimed:

1. In a device of the class described, a generator positioned in atubular housing, a drive shaft for the generator having a fancooperating with one end of the housing to circulate air'through thegenerator longitudinally thereof, a functionallyunitary weather-proofcasing enclosing regulators in circuit with the generator to control theelectrical characteristics of the generator output, a pair of terminalsexterior of the casing adapted to cooperate with the generator when thecasing is in operative position coaxially with the other end of thehousing, an indentation in said casing and a single output terminalexternal of the casing within said indentation whereby said terminal isinside the outside contour of said casing.

2. In a device of the class described, a generator positioned in atubular housing, a drive shaft for the generator having a fancooperating with one end of the housing to circulate air through thegenerator longitudinally thereof, a functionally-unitary weather-proofcasing enclosing regulators in circuit with the generator to control theelectrical characteristics of the generator output, a pair of terminalsexterior of the casing adapted to cooperate with the generator when thecasing is in operativeposition coaxially with the other end of thehousing, an output terminal external of said casing, a visual signalingmeans in circuit with one of the regulators and positioned'in the casingto indicate the charging condition of the generator during operation,and a transparency in said casing through which said signaling means isvisible.

3. In a device of the class described, a generator positioned ,in atubular housing, a drive shaft for the generator extending from one-endof said housin a transverse wall at the opposite end of said generator,conductors through said wall from the generator, regulators mounted onsaid wall remote from the generator and in circuit through saidconductors with the generator to control the electrical outputcharacteristics thereof, a weather-proof cap mounted on said wall andforming a chamber therewith to house said regulator, an indentation insaid cap, a single output terminal external of the cap within saidindentation whereby said terminal is inside the outside contour of saidcasing. a visual signaling means in circuit with one of the regulatorsand positioned in said cap to indicate the charging condition of thegenerator during operation, and a transparency countersunk in said capalso within the outside contour of said casing through which saidsignaling means is visible.

4. In a device of the class described, a generator having a tubularfield frame provided with perfo rated end members, an armature rotatablysupported by said end members in a cooperative relation with the fieldframe, said armature having a commutator adjacent one end, driving meanscooperating with the armature at the other end, fan means forcirculating air positioned adjacent the end member cooperating with thedriving means to draw air longitudinally of the armature through theperforated end members, an imperforate shielding base member mounted onthe frame in cooperative relation with the perforated end memberadjacent the commutator to form a chamber, regulating devices mounted onsaid base member having terminals sealed therein extending into saidchamber to connect into electrical circuit with the generator, ashielding cover attached to said base member to form a weatherproofenclosure for the regulatory devices, and a binding post cooperatingwith said shielding cover to form the output terminal of the generator.

5. In a device of the class described, a generator having a tubularfield frame provided with perforated end members, an armature rotatablysupported by said end members in acooperativc relation with the fieldframe, said armature having a. commutator adjacent one end, drivingmeans cooperating with the armature at th other end, fan means forcirculating air positioned adiacent the end member cooperating with thedriving means to draw air longitudinally of the armature through theperforated end members, an 'imperforate shielding base member mounted onthe frame in cooperative relation with the perforated end memberadjacent the commutator to form a chamber, a perforated band attached tothe base member and the frame enclosing the chamber. regulating devicesmounted on said base member having terminals sealed therein extendinginto said chamber to connect into electrical circuit with the generator,at shielding cover attached to said base member to form a weatherproofenclosure for the regulatory devices, and a binding post cooperatingwith said shielding cover to form the output terminal oi the generator.

6. In a device of the class described, at gen= erotor having a tubulariieid i'rome provided with perforated end members, an, armaturerotntobly supported by said end members in o cooperative relation withthe field frame, said ormoture hov irisa commutator, adjacent one end,driving means cooperating with the armature at the other "end, fan meansfor circulating elir positioned ari= Jacent the end member cooperatingwith the driving means to drew sir ionoitndinollv of the thereinextending into said chamber to connect into electrical circuit with thegenerator, a shieldinc cover attached to said base member to iorm e,weatherproof enclosure for the regulatory devices, visible signallingmeans cooperating with seiei shielding cover to indicate e, condition oithe regulatory devices, and e, binding roost cooperating with saidshielding cover to form the output terminal or the generator.

H. MIDDLETON.

